Portable electric drill.



W. O. HAPEMEISTER.

PORTABLE ELECTRIC DRILL.

APPLICATION FILED DEG.11, 1908.

Patented May 3, 1910.

suisETs-sHnET 1.

2 jawed/41:?

ag/W W. C HAFEMEISTER.

PGRTABLI-j ELECTRIC DRILL.

APPLICATION 2mm nu; 11, 1902.

956,849. Patentsd May 1910.

2 SHEETS-$31331 2.

I v presently described.

UNITED STATES PATENT OFFICE.

WELIAM- c. HAFEM'EIS'PER, or CLEVELAND, OHIO, ASSIGNOR, BY MESNE ASSIGN- mniv'rs, TO THE VAN norm & BUTTON CGMPANY, or CLEVELAND, OHIO, A COR- PORATION OF OHIO.

PORTABLE ELECTRIC DRILL.

To all whom it may concern:

"Be it known that I, WILLIAM C. Harn- MEISTER, a citizen of the United States, and

a resident of Cleveland, county of Cuyahoga, and State of Ohio, have. invented a new and useful Improvement in Portable Electric Drills, of which the following is a specification, the principle of the invention being herein explained and the best mode in which I have contemplated applying that principle,

ing of the tool, is an electric motor, at least certain of the features'of the invention will be equally adaptable for incorporation in a tool where other motive power than electrioity is employed.

Said invention,-then, consists ofthe means hereinafter fully described and particularly pointed out in the claims.

The annexed drawings and the following description set forth in detail certain mechanism, embodying the invention, such disclosed means constituting, however, but one of various mechanical forms in which the principle of the invention may be used.

In said annexed drawings :Figure l is an axial section of an electrically operated portable drill embodying my several improvements; and Fig. 2 is a perspective view of an interior .supporting member together with the parts borne thereby.

Having regard first of all to Fig. 1, the

tool will be seen to comprise a motor A that is included withina casing B, consisting of a body portion bof substantially cylindrical form, and two end portions or caps b b therefor. Such body portion is preferably made out of drawn seamless tubing, while the caps are stamped out of sheet metal, be ing formed respectively with an inwardly and outwardly fprojecting flange b b for the reception 0 bearings 11 b as will be Specification of Letters Patent.

Patented May 3, 1910.

Ap t -son filed December 11, 1908. Serial No. 466,960.

, The motor proper comprises the field coils a that are secured to the inner surface of the cylindrical easing bod-y Z) and an armature a mounted upon the tubular motor shaft o of which the one end is journaled in' bearings b in the upper cap, the other end in bearing 0 in a transversely disposed member C secured within the cas ing near its lower end. Alined with said motor shaft, is the drill spindle D mounted in a suitable bushing press-fitted in the flange in the lowercap. The bearing 6 for the motor shaft provided in the upper cap 7; comprises a bushing similarl press-fitted into the opening in said cap, tlie inner-end of said bushing being bent over to engage the flange surrounding such opening. An internally threaded ring 11 is tightly fitted within said bushing and other rings 1) b in turn are fitted within said first ring, so as to provide an adjustable ball race, as will be readily understood upon reference to the drawing in qi'iestion. Lying within the motorshaft a which is hollow, is a feed screw, a whereby the tool may be forced onto the worlqupon suitably rotating the handle a as will likewise be readily understodd. The lower end of the motor shaft is provided with a driving pinion a from which motion is transmitted to an internal gear (Z mounted upon the drill spindle, by means of the intermediate gearing now to be described. Such internal gear upon the drill spindle is in effect part of a cup-like member (1 that is mounted directly upon the spindle, such cuplile member serving to receive the lower portion of the intermediate casing member C previouslyreferred to as supporting the intermediategearing. The latter comprises (see 2) two short intermediate shafts 0 each of which bears at its upper end a gear 0' that meshes with the driving pinion a on the motor shaft and 'at the lower end a pin ion 0 that meshes with the internal gear (Z upon the drill spindle. Bearings for such 'intermediate shafts are formed in said member between the gear 0 and pinion and in the lower portion of the member that extends below such pinion and into the re cess formed in the cup-shaped gear-bearing member d" of the spindle. The gear (1' whereby such shaft is connected with the motor shaft is recessed on its upper face to form one part of a ball-race, can

as to prevent the escape of lubricant from the chamber formed between such cap and the upper face ofthe gear. The lubricant is designed to be supplied to this chamber from an oil' chamber or cup C in the supporting member, that extends exteriorly through the casing A, and communicates interiorly with the bearing of the corresponding intermediate shaft. The latter being provided with a passage 0 adaptedto connect said oil-supply chamber or cup with the chamber formed between the cap and the-upper face of the gear, the lubricant will be fed to such latter chamber and thence to the ball races and intermeshing gear teeth. At the same time sufficient lubricant will escape downwardly along the bearing with,

which the chamber communicates, to amply provide for the lubrlcation of the pinion c and the lower bearing of the shaft, any

excess of lubricant being conserved in the depression formed in the upper portion of the gear-bearing member d, thence to be fed to the spindle bearing in bushing 79 by an'other passage 0 Such oil chambers or cups, it should be noted serve the further function of dowel pins, to retain supporting member in place within the casing.

The foregoing construction of drill has been found to provide an extremely rigid support for the various moving parts, withoutsacrificing but rather securing additional compactness and lightness both of. which are extremely desirable characteristics in a portable tool, and need not be explained at length. Moreover the use of stamped caps renders the. construction much more economical, than where the same are cast and then machined in order to be fitted to the casing, and to provide the necessary bearings for the motor shaft and spindle. Finally by providing the end thrust bearings for the intermediate shafts, and furnishing ample lubricating means, these parts, which are subjected to the severest wear, are en abled to endure substantially as long as the remainder of the machine, thus contributing to the durability and practical character of the latter.

Other modes of applying the principle of my invention may be employed instead of the one explained, change being made as casing end; a gear borne by the inner end of said spindle; a driving pinion on the adjacent end of said motor-shaft; an lntermediate shaft extending through and journaled in said supporting member; a pinion on its lower end meshing with said spindle gear; a gear on its upper end meshing with said driving pinion; and thrust: bearings for the upper end of said intermediate shaft.

2. In a tool of the character described, the combination with a motor and a casing therefor; of a transversely disposed supporting member within said casing near one end thereof, the motor-shaft being journaled in said member and the other casing end; a tool spindle mounted in such first-named casing end; a gear borne by the inner end of said spindle; a driving pinion on the adjacent end of the motor-shaft; an intermediate shaft extending through and 'journaled in' said supporting member; a pinion on its lower endmeshing with said spindle gear; a gear on its upper end meshing with said driving pinion, the upper face of said lastnamed gear forming one part of a ball race; a cap mounted upon said support-in mem her and inclosing said gear, said cap caring the other part of such in -c; and a ball race between said gear and member, whereby an end-thrust bearing is provided for said intermediate shaft.

3. In a tool of the character described, the combination with a motor and a casing therefor; of a transversely disposed supporting member within said casing near one end thereof, the motor-shaft being journaled in said member and the other casing end; a tool spindle mounted in such first-named casing end; a gear borne by the inner end of said spindle; a driving pinion on the adjacent end of the motor-shaft; intermediate shafts extending through and journaled in saidsupporting member; a pinion on the lower end of each such intermediateshaft meshing with said spindle gear; a gear on such shafts upper end meshing with said driving pinion, the upper face of said lastnamed gear being recessed to form one part of a ball race; a cap mounted upon said supporting member and inclosing said gear, said cap including a central plate adjustably se cured therein and bearing the other part of such race;-anda ball-race between said gear said supporting member and inclosing said and member, whereby an-end-thrust bearing is provided tor said intermediate shaft. i

4-. In a toolpf thecharacter described, the

combination with a motor and a casing therefor; of a transversely disposed support- 'ing member Within said casing near one end thereof, the lTIUtOI'rShHft being journaled in said member and the otlier "casing end; -a tool spindle mounted in such first-named casing end; a gear borne by the inner end of said spindle; a driving-pinion on the adjacent end of the motor-shaft; intermediate shafts extending through andjjournaled in said supporting member; a pinion on the lower end of each such lntermedlate shaft me'shing with saidspindle gear; a. gear on each shafts upper end meshing with said driving pinion, the upper face of said lastunder side of said cap, said gear-bearing a gear; a gear washer exteriorly titted to said flange; and" a ball race between said gear and member.

5. In" a. toolof the, character described, the combinationivith a motor and a casing therefor; of a transversely disposed supend; thereof, the motor-shaft being journal adjacent end of said motor-shaft; an intero'n'its lower e tmeshing with said spindle 'n' 'its upper end meshing with said drivin' 1m n and anoil. chamber in said su pers, ber op eiiingexteriorly through said eas ng and communicating interiorly with the bearingif-of said 'intermedi'ate shaft, the lattertbeingprovided with a passa ge adapted ttoflconneet sa i'dioil chamber with the upper face of the ear borne by said shaft.

6. In, a tool "of the character described, the combination of a motor and a casing.-

therefor ;.'of a transversely disposed sup porting member within saidcasing near one on thereof, the motor-shaft being ournaled aid member'andthe other'casingend; a

tool-spindle 'mounted in such first-named.

.casingend; a gean -borne by the flinneriend 1 of saidspindle; adriving pin'ion on'the ad-.

.3aeent. end of 3 said motor-shaftfan inter- 'med iate'shaf-t extending. through and ournal'ed n said" supporting member; zI-"PJIIIOD' 1 on its lowerend meshing with said spindle gear; a gear "on its upper endymeshing with said-driving pinion;'a cap mounted upon n said memberand the other casing cnd';,'atool spindle mounted in jsnchfirstn arri ed-easing end; 1a" gear borne eby the inner end of said spindle; a driving pinion ,onfthe member opening exteriorly through said casing and communicating interiorl with the "bearing of said intermediate shaft, the lat- 7o ter-being provided with a pa ssage adapted to connect said oil chamber with the chamber formed betweeii said cap and the upper face of the gear borne by said-shaft.

I 4 7. In a' tool of the-character described, the combination of a motor and tool spindle;

a casing for said motor, said casing comprising body "portion and two stamped metal end portions or caps with central, flanged openings: a supporting mem'ber'within said casing intermediate between said eaps,.said member having a bearing-for, one end of the motor-shaft; and bearings for the tool sp1n-' dle and the otherend of said motor-shaft I fitted in'the flanged openings in said caps," 8'5 such last-named motor bearing including a bushing pressed into such opening and bent overdo engage the flange, an .internally tln' eaded ring fitted within said bushing,

and other rings, composing a ball race, se-

cured within said first ring. v

'8. In a tool of the character described, the combination with a motor and a casing therefor; of a transversely disposed supf porting member within said casing near one ;end thereof, the motor-shaft being ournaled porting member within said casing near one in said member and the other-casing end; a tool splndle mounted in such brat-named easing end; an internal gear borne by the inner end of said spindle-and formed with a depression on its upper face; a driving pinion on the adj acent end of said motor-shaft anintermediate shaftiextending through and jonrnaled' in said supporting member: a

pinion On jitSi lower endmeshing with said spindlegear; a gear on its upper end meslr 0 I 111g 'ivlth said driving pnnon; and an Oll chamber insaid supporting member opening exteriorly through said casing and coinm'unicatin'g interiorly with the bearing of 9 said intermediate sha-ft, a passage being pro- 'v'ided in "said"spindle gear-leading from i the depression therein to' thespindle-bearing. 9; In a tool of the character described, the

combination With.;a-motor and a casing 115 therefor; of a transversely disposed sup-. porting member within'said casing near one I "end thereof, the motor-shaftbeing ournaled infsaidl-member and the other easing end; a;

tool spindle mounted in su'clnfirst-named ,easing' endfan internal gear borne by'the inner end-of said spindle and formed with" adpression on its ripper face; anihterme idi'at'e shaft extending-through and j ournaled "in'said supporting member; a pinion ,on its llower endvme s hing with said'spindle gear; a gear on itsupper end meshing with said g driving pinion; a cap; mounted upon said supporting member and inclosing said gear; a and men chamber insaid supporting m emb0 her opening exteriorly through said casing and communicating interiorly with the bearing of said intermediate shaft, the latter being provided with a passage adapted to connect said oil chamber with the chamber formed between said cap and the upper face vof the gear borne by said shaft, and another passage being provided in said spindle-gear leading from the depression therein to the spindle bearing. r

10. In a tool of thecharacter described,

the combination with a motor and a casing therefor; of a transversely disposed supporting member w1th1n said casing near one end thereof, the motor-shaft beingjournaled in said member and the other casing.end; a tool-spindle mounted in such first -named casing end; a gear borne by the inner end of said spindle and formed with a depression on'its upper face adapted to retain lubricant, said gear being provided with apassage extending from such depression to .'the spindle bearing; a driving pinion on the adjacent end of said motor-shaft; an inter- -mediate shaft extending through and having spaced bearings insaid supporting member;

a'p-inion on said intermediate shaft between said spaced bearings and meshing with said esasae depression on its upper face; a driving pinion on the adjacent end of said motor-shaft; an intermediate shaft extending through and having spaced bearings on said supporting member, the lower of such bearings lying in the depression in said spindle gear; a pinion on said intermediate shaft between such bearings and meshing with said spindle gear; and a gear on its upper end meshing with said driving pinion.

12. In a tool of the character described, the combination with a motor and a casing therefor; of a transversely disposed supporting member within said casing near one end thereof, the motor-shaft being journaled in said member and the other casing end; a

tool spindle mounted in such first-named casing end; an annular gear borne by the in ner end of said spindle and formed with a depression on its upper face adapted to retain lubricant, said gear being provided with a passage extending from such depression to the spindle bearing; a driving pin- WILLIAM (1- HAFEMEISTER.

Attested b H. L. SCHNEIDER, JNo. F. QBERLIN. 

